工業(yè)自動化控制系統(tǒng)中的PLC與DCS的區(qū)別
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工業(yè)自動化控制系統(tǒng)中的PLC（可編程邏輯控制器）與DCS（分散控制系統(tǒng)）在多個方面存在顯著差異。以下是它們之間的主要區(qū)別：
1. 起源與應(yīng)用領(lǐng)域
PLC：起源于20世紀60年代末期，最初由美國公司Modicon（現(xiàn)在的施耐德電氣）開發(fā)，是為了解決傳統(tǒng)繼電器控制方式存在的布線復(fù)雜、維護困難等問題。PLC廣泛應(yīng)用于工業(yè)自動化領(lǐng)域，包括航空航天、鋼鐵、煙草、制藥、食品、冶金、礦山、水處理、交通運輸?shù)榷鄠€行業(yè)。它主要用于監(jiān)控和控制生產(chǎn)過程中的機械、電氣和電子設(shè)備。
DCS：產(chǎn)生于20世紀70年代中期，最初由儀表制造廠商研發(fā)出來，主要應(yīng)用于化工行業(yè)。DCS是專門為連續(xù)過程控制而設(shè)計的，集計算機技術(shù)、通信技術(shù)、CRT技術(shù)和控制技術(shù)于一體，具有高度的自動化和集成化特點。它主要應(yīng)用于大型工業(yè)自動化系統(tǒng)，如發(fā)電、石化、鋼鐵等行業(yè)的過程控制。
2. 控制規(guī)模與結(jié)構(gòu)
PLC：通常用于點數(shù)少、開關(guān)量大的環(huán)境中，適用于小規(guī)模、單一過程的控制。PLC的控制結(jié)構(gòu)相對簡單，以單臺設(shè)備或小規(guī)模生產(chǎn)線為控制對象。
DCS：適用于多點的大規(guī)模連續(xù)控制環(huán)境，具有高度的分散性和可擴展性。DCS系統(tǒng)通過多個分散的控制單元和分布式的輸入/輸出設(shè)備實現(xiàn)對整個工業(yè)過程的控制和監(jiān)測，控制規(guī)模更大、結(jié)構(gòu)更復(fù)雜。
3. 數(shù)據(jù)庫與編程語言
PLC：通常具有上、下兩個數(shù)據(jù)庫，主要用于順序控制，用邏輯量進行判斷和輸出。其編程語言包括梯形圖（Ladder Diagram）、結(jié)構(gòu)化文本（Structured Text）或功能塊圖（Function Block Diagram）等。
DCS：上位和下位使用統(tǒng)一的數(shù)據(jù)庫，下位功能塊為編程工具，上位有自己獨立的視控制系統(tǒng)控制界面。DCS系統(tǒng)的編程語言更為復(fù)雜，需要處理大量的數(shù)據(jù)和復(fù)雜的控制邏輯。
4. 控制方法與信號處理
PLC：在處理IO信號方面，PLC制造商習慣于將所有信號轉(zhuǎn)換成數(shù)字量進行處理，這使得PLC在數(shù)字控制方面具有較高的精度和可靠性。
DCS：DCS制造商則習慣于將所有信號轉(zhuǎn)換成模擬量進行處理，這有助于實現(xiàn)對連續(xù)過程的精確控制。DCS系統(tǒng)還具有高度的冗余性和容錯性，能夠在出現(xiàn)故障時自動切換到備用系統(tǒng)，確保生產(chǎn)過程的連續(xù)性和穩(wěn)定性。
5. 優(yōu)勢與適用場景
PLC：具有靈活性高、可靠性好、易維護、成本低等優(yōu)點。它特別適用于中小型的離散控制工作，如自動化生產(chǎn)線、機器人控制等。
DCS：DCS系統(tǒng)更像是一個封裝好的系統(tǒng)，使用相應(yīng)的模塊可以方便地進行系統(tǒng)的組態(tài)、配置和擴展。DCS在大型、復(fù)雜的工業(yè)自動化系統(tǒng)中具有更高的控制精度和穩(wěn)定性，適用于需要高精度控制的應(yīng)用場景，如化工、電力、冶金等行業(yè)的主控單元。
綜上所述，PLC與DCS在起源、應(yīng)用領(lǐng)域、控制規(guī)模與結(jié)構(gòu)、數(shù)據(jù)庫與編程語言、控制方法與信號處理以及優(yōu)勢與適用場景等方面均存在顯著差異。在選擇工業(yè)自動化控制系統(tǒng)時，需要根據(jù)具體的應(yīng)用場景和需求來選擇合適的系統(tǒng)。
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US Ultra Machine Tool Circuit Board E011055-A1 _ E011055A1 _ EO11O55-A1
US Ultra Machine Tool CNC Circuit Board E011030-A1 _ E011030A1 _ EO11O3O-A1
Uson CPU Card 486A300H _ 486A3OOH
VACUUM BARRIER 18110 PC BOARD
VACUUM INSTRUMENT CORP 584-334 VicLeak Detect MD-390 AC Control Board FREE SHIP!
VALMET AUTOMATION A413001 60F 32M 09 CPU BOARD
VALMET METSO AUTOMATION A413015 NCU 09 CIRCUIT BOARD
VALMET METSO AUTOMATION A413016 NCU2 14 CIRCUIT BOARD
VALMET METSO AUTOMATION A413016 NCU2 14 CIRCUIT BOARD ONE CLIP MISSING
VALMET METSO AUTOMATION A413061 DMU BOARD VPA 420355-4B
VALMET METSO AUTOMATION A413082 CPU BOARD
VALMET METSO AUTOMATION A413143 BIU 84 BOARD
VALMET METSO AUTOMATION A413370 ESU BOARD 422138-3B
Valmet Micro/IC I/O Base Board C3200-NIA-12500 Circuit Board Card
VAN DORN 330038 OUTPUT BOARD
Van Dorn Instrumentation Board 370087 Circuit Board PCB Vandorne
VARIAN 03-918031-01 MOTHER BOARD, REV 15, VARIAN ASSY.03-918031-01 BOARD,
VARI-TECH 7068 INTERFACE CONTROL BOARD - REFURBISHED - !!!
VCM3 3Z2K0361-1 SR7VCM3-G1 2N2K2221-A02 Module Card Board
VEE-ARC 404-036 C CIRCUIT BOARD PC7000 - REFURBISHED -
VEE-ARC 404-055 B BASE DRIVER CIRCUIT BOARD - REFURBISHED -
VEE-ARC Regulator Board Model: PC7000
VEECO INSTRUEMENTS INC 16001-1 BOARD XRF-4X00/5X00
VERIFONE 13740-13 RUBY CPU-3 65-KEY BOARD
VERIFONE 13740-14 24 MHZ CPU-3 BOARD 120-KEY
VERIFONE E231 DELL VENUE 8 SCANNER AND CARD READER CASE M173-210-01-WWA
VERIFONE MX830 M090-307-05-RB CARD READER TERMINAL
VERIFONE MX915 CARD READER M132-409-01-R REV C12
VERIFONE MX915 CARD READER TERMINAL M132-409-01-R REV D02
VERIFONE NURIT 8320S CREDIT CARD TERMINAL W/ ADAPATERS - -
VERIFONE NURIT 8400 CREDIT CARD READER PAYMENT TERMINAL W/ ACCESSORIES
VERIFONE OMNI 3750 DUAL MODE CREDIT CARD TERMINAL POINT OF SALE KIT
VERIFONE OMNI 5600 DUAL COMM TERMINAL IP/DIAL CREDIT CARD MACHINE
VERIFONE OMNI VX510 CREDIT CARD PAYMENT TERMINAL VX510 M251-000-03-NA1
VERIFONE PIN PAD W/ EMV CHIP AND CARD READER VX805 CTLS M280-703-AB-WWB-3
Verilink 4016-R ESF CSU Card 319-010189-001 REV C
VERSALOGIC STD PSC PN 2530/1_PN2530/1 PCB CIRCUIT BOARD OKUMA CNC LATHE
Vibtronic Frequency Control Board SCE-E60-1
Victor Circuit Board 64805 _ 648O5
Victor Circuit Board PCB 64806 _ 648O6
Victor CNC Circuit Board NU-S-001 _ NUS001 _ NU-S-OO1 _ NUSOO1
VIDEO JET 356400-02 MOTHERBOARD
VIDEO JET 360400-B PC BOARD
VIDEO JET MOTHER BOARD 356400-02B
VIDEOJET 351660 CIRCUIT BOARD
VIDEOJET 351660H PRINTHEAD DRIVER BOARD
VIDEOJET 356400-03 CIRCUIT BOARD
VIDEOJET 356400-15 CIRCUIT BOARD
VideoJet 360602 Control Board
VideoJet 360605 Control Board
VIDEOJET 375080-E CONTROL BOARD
VIDEOJET 375080-G CONTROL BOARD
VIDEOJET 375080SMT CIRCUIT BOARD
VIDEOJET 375081-B PC BOARD
VIDEOJET CIRCUIT BOARD 1054969
Videojet Marsh Driver Card 15429 ML4 Print NIB
VIDEOJET SP354064 PCB, PROD DETECTOR ASSY
VideoJet SP360528 Power Backplane PCB
View Engineering 11220-505 REV A Interface Board
View Engineering 11500-505, 11505-2 REV A Interface Board
View Engineering 2109385-507 Rev. A Energy Conversion Unit Control Board
View Engineering PWB 2107221 REV B Interface Card
VIZIO P552UI-B2 MAIN BOARD 748.00602.0011 734.00603.0011
VIZIO P552UI-B2 POWER SUPPLY BOARD PA-3241-1W 056.04245.6041
VIZIO POWER SUPPLY BOARD 715G6100-P01-003-002H
VIZIO ZSUS BOARD EAX34042701
VOC1 3Z2K0467-1 SR7VOC1-G3 2N2K2550-B02 Module Card Board
VOEDING 576939 CIRCUIT/DATA BOARD
Voltak Circuit Board D.008.112_D008112_D-008-112_D.OO8.112_DOO8112_D-OO8-112
VSCIO REV F Q003962001 Q095334002 FIRE ALARM CIRCUIT BOARD CARD
VT 3342261 PC BOARD
VXI Tech SM7000 RF Microwave Switch Card. Includes 2X SM7274, 4X SM7270 RF Swit
VXI Technology 6001/SMP6001 High-Density Multiplexer Module Card
VXI VT1503A BOARD
WABTEC ELECTRONICS 11655P-F 11655PF REV F CPU CIRCUIT BOARD #38
WABTEC ELECTRONICS 11655P-H REV H CPU BOARD #36
WADDINGTON ST-6Z PC BOARD CONTROL SYSTEM SONA-TROL
Warden Tronics Printed Circuit Board PCB 1124-101 Rev C 1124101
WARNER ELECTRIC 9540-3106 BOARD
Warner Electric SE2132 DC Drive, *For Parts Only* (Short on Circuit Board)
Warner Swasey / Comstar 8003-2102 Circuit Board 80032102 _ 8OO3-21O2
Warner Swasey Circuit Board Connector Module EK-7192-F _ EK7192F
WATERBURY D8486-33110-800 CIRCUIT BOARD
Watlow Anafaze PPC-AITB Analog Input Terminal Board w/ Assorted Keys
Watlow Anafaze PPC-TB50 Open Process Control Board
We build full panelboards with 1 year warranty just ask
Weidmüller Relais Board RSM111376 GEB
WENTECH KELE MOB-8 MANUAL OVERIDE BOARD
Wera EMG Recotec Out 24 Circuit Board RE-OUT CC 93-10-06, RE-24OUT SC, REOUTCC
Wera M/10 Card RE-ME-0T CC_RE-ME-0T-CC_RE-ME-OT-CC_93-11-22 Wera EMG Recotec
Wera-Profilatro Axis 4-5 and 5-6 Circuit Board 93-11-24_931124_RE-ACHSE-N CC
Wera-Profilatro Recotec Axis 3-4 Circuit Board 93-11-24 _ 931124
WEST CH FDPT FDPT3611R 30 AMP 600V F PANEL PANELBOARD SWITCH HARDWARE
WEST CH FDPT FDPT3633 100 AMP 600V FUSIBLE PANEL PANELBOARD SWITCH SER A
WEST CH FDPT FDPT3633R 100 AMP 600V F PANELBOARD SWITCH HARDWARE fdpt3233r
WEST FDPS FDPS363R 100 AMP 600V PANELBOARD SWITCH fdps323r 240v HARDWARE
WEST FDPS FDPS363R 100 AMP 600V PANELBOARD SWITCH fdps323r 240v HARDWARE NO FINS
Westamp Control Board / DC Servo Drive?? 29666-3 _ 296663 _ 979
Westamp Control Board 30066-11 _ 3006611 _ 30062-A _ 3OO62A
WESTAMP, INC. SERVO DRIVE CIRCUIT BOARD PCB _34246-15_3424615
WESTERN RESEARCH & DEVELOPMENT WPC100720M1 CIRCUIT BOARD
Western Servo Design 10119-100 RVB Power Board
Westingho 100 amp PANEL PANELBOARD MLO 208v 240v/120v breaker 3 phase
WESTINGHO 1200 AMP 480v 277v PRINGLE PANEL PANELBOARD 1100 1000 QA1233CBC
WESTINGHO 1736A32G01 CIRCUIT BOARD
WESTINGHO 223P790H01G PC DRIVE BOARD
WESTINGHO 225 AMP PANEL PANELBOARD 208v/120v 240v 3 phase breaker 200 150 mai
WESTINGHO 589C517G01 SPEED AMP BOARD
WESTINGHO 7510E56G0 POWER BOARD
WESTINGHO 800 AMP 480v 277v PRINGLE PANEL PANELBOARD QA0883B
WESTINGHO 8204D51 CIRCUIT BOARD
WESTINGHO BOARD 2838A32G01
WESTINGHO BOARD 2838A45G01
westingho cdp 800 AMP 480 277v 3 PHASE BREAKER PANEL PANELBOARD 600 208v 120v
westingho cdp 800 AMP 480v 277v 3 PHASE BREAKER PANEL PANELBOARD 600 208v 120
westingho cdp 800 AMP 480v 277v PHASE BREAKER PANEL PANELBOARD 600V 208v 120V
WESTINGHO CH FDP FDP325R 400 AMP 240V FUSIBLE PANEL PANELBOARD SWITCH ARK
WESTINGHO CH FDPS325 400 AMP 240V F PANEL PANELBOARD SWITCH fdps365 600v
WESTINGHO CH FDPS365 400 AMP 600V F PANEL PANELBOARD SWITCH
WESTINGHO CH FDPT FDPT62X3 30 AMP 240V F PANEL PANELBOARD HARDWARE SWITCH
WESTINGHO CH FDPW FDPW365R 400 AMP 600V F PANELBOARD SWITCH fdpw325r 240v
WESTINGHO CUTLER HAMMER 100 AMP 240/120V PANEL PANELBOARD MCC BUCKET
westingho cutler hammer prl3 400 AMP PANEL PANELBOARD breaker 480v/277v 300
WESTINGHO DRIVE BOARD 7064C03G01
WESTINGHO FDP FDP365 400 AMP 600V FUSIBLE PANEL PANELBOARD SWITCH fdp325 240v
WESTINGHO FDP FDP365BR 400 AMP 600V F PANELBOARD SWITCH HARDWARE fdp325br
WESTINGHO FDP FDP365R 400 AMP 600V F PANEL PANELBOARD SWITCH HARDWARE
WESTINGHO FDP326R 600 AMP 240V F PANELBOARD SWITCH HARDWARE DETACHED
WESTINGHO FDPS FDPS223R 100 AMP 240V F PANELBOARD SWITCH fdps263r 600V
WESTINGHO FDPS FDPS324 200 AMP 240V FUSIBLE PANEL PANELBOARD SWITCH
WESTINGHO FDPS FDPS364 200 AMP 600V F PANEL PANELBOARD SWITCH fdps324 240
WESTINGHO FDPS FDPS364R 200 AMP 600V F PANELBOARD SWITCH fdps324r 240v
WESTINGHO FDPS FDPS364R 200 AMP 600V PANELBOARD SWITCH fdps324r 240v
WESTINGHO FDPS FDPS364R 200 AMP 600V PANELBOARD SWITCH fdps324r 240v HARDWARE
WESTINGHO FDPS FDPS365 400 AMP 600V F PANELBOARD SWITCH HARDWARE fdps325
WESTINGHO FDPS FDPS366 600 AMP 600V F PANELBOARD SWITCH HARDWARE CARD ARK
WESTINGHO FDPS363 PANELBOARD SWITCH
WESTINGHO FDPT FDPT2233 100 AMP 240V PANELBOARD SWITCH SER A
WESTINGHO FDPT FDPT3222 60 AMP 240V F PANELBOARD SWITCH fdpt3622 600v
WESTINGHO FDPW FDPW325MR 400 AMP 240V PANELBOARD SWITCH HARDWARE fdpw325
WESTINGHO FDPWS FDPWS324R 200 AMP 240V PANELBOARD SWITCH HARDWARE
WESTINGHO FDPWS FDPWS364R 200 AMP 600V F PANELBOARD SWITCH HARDWARE
WESTINGHO FDPWS FDPWS364R 200 AMP 600V PANELBOARD SWITCH fdpws324r 240v
WESTINGHO FDPWT FDPWT3612R 60 AMP 600V F PANEL PANELBOARD SWITCH HARDWARE
WESTINGHO FDPWT FDPWT3633R 100 AMP 600V F PANELBOARD SWITCH HARDWARE
WESTINGHO PC BOARD 3A99158-G01
WESTINGHO PWM5880C86H01PC BOARD W/RED LIGHTS
Westingho Time Delay 1275C74G03 229P173H05B Circuit Board Card
WHEDCO PC CONTROL BOARD 17003699 REV. A
WOLF MXM2-E4690 PCB BOARD MODULE - -
WRIGHT MACHINERY 92C346 REGISTRATION CONTROL BOARD
WTC PC-937A-A-00A BOARD A3-1324-52
WULFTEC UNIVERSAL BOARD VERSION 1 UB1
Wyko Corporation 6190094 Digital/Analog Interface Board
Wyko PCB 6190100 ASSY-8300190 Rev-A Board w/PC-Hydra Rev-C
WYSE 990097-02 PCBA WY350 W MURATA MONITOR ##
XA4 5D73417G01 FRICTION BREAK BOARD 268P401HO2 1091-01
Xceed ID Card Reader XF1060 Access Control Unit Accessory
Xceed ID Card Reader XF1500P *s as seen* Access Control Unit Accessory
XEL 4W ETO PLUG IN CARD L8100-902
XEROX MOTHERBOARD P/N 960K13761-A FOR TIGRIS DT100 CP
Xycom 9465 KPM_ MSPCB043-08 _ MSPCB043-09 _ MDB 64_57507 _Display/Control Panel
XYCOM ACC STEPMASTER 279297, XYCOM 279297 ACC STEPMASTER, CNC BOARD-MOTHERBOARD
XYCOM I/O MODULE BOARD XVME-203
XYCOM STATION 300 SERIES W/ KEYBOARD
Xyplex MX-1600-004 Maxserver 16 Port Server Terminal w/ TS720 Memory Card
XYZ ELECTRONICS PC BOARD F0025-00121A
Yakawa Circuit Board JANCD-GCP03 _ DE6428679 Rev C2 GCP 03 Matsuura VMC MC-500V
Yakawa Circuit Board JANCD-GSR1 _ DE6428680 Rev D _ Matsuura VMC MC-500V
YAMAHA KB8-M4210-010 CPU BOARD
YAMATAKE- HONEYWELL 82407390-001 IBI BOARD W/82408213-001 82407390001
